Mechanics of Distortional-Global Interaction in Fixed-Ended Lipped Channel Columns

• Autor(a) principal: Martins, André
• Data de Publicação: 2016
• Outros Autores: Camotim, Dinar, Gonçalves, Rodrigo, Dinis, Pedro
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10362/20157
• topic: Fixed-ended lipped channel columns; Distortional-Global interaction; Generalized Beam Theory (GBT);Geometrically non-linear imperfect analysis (GNIA).

This work reports the results of a numerical investigation concerning the elastic post-buckling behaviour offixed-endedthin-walledlipped channelcolumnsaffected bydistortional-global(D-G)interaction. The columns analysed (i) exhibit cross-section dimensions and lengths ensuring simultaneous distortional and global critical buckling loads, and (ii) contain critical-mode initial geometrical imperfections (linear combinations of D and G buckling modes). For comparison and clarification purposes, the post-buckling behaviour ofcolumnsbucklinginan“isolated” distortional mode and containing “pure” distortional and global (flexural-torsional) initial geometrical imperfections are also analysed. The results presented and discussed are obtained through geometrically non-linear Generalised Beam Theory (GBT) analyses and provide the evolution, along given equilibrium paths, of the column deformed configuration (expressed in GBT modal form),relevantdisplacementprofiles and modal participation diagrams, making it possible to acquire in-depth knowledge on the column D-G interaction mechanics. Finally, particular attention is paid to interpreting the differences exhibited by the several aforementioned column post-buckling behaviours.